A royal insider admitted that her presence at his home indicates the relationship is serious.

“To come and go at a royal home is a very concrete sign that they have become extremely close,” a courtier told the Daily Mail.

Harry has been single since he split from previous long-term girlfriend Cressida Bonas more than two years ago.

Meghan appears to have spent a lot of time in the U.K. over the summer, posting pictures from London to her one million Instagram followers in June, July, August and September.

She is taking time off from filming her popular US television legal drama, Suits, to be with Harry, after reportedly telling her producers that she had “something important” to do.

According to the news report, most of the royal family will be in London this weekend including Queen Elizabeth and Prince Philip, Harry’s father Prince Charles, who is flying back from Bahrain on Friday and his wife Camilla, and the Duke and Duchess of Cambridge, who live in Kensington Palace, so Harry may be planning to take the opportunity to introduce his girlfriend to his entire family.

The prince took the unprecedented move of confirming their relationship and condemning the “wave of abuse” in a strongly worded statement issued from his office in the wake of the coverage of his relationship with the actress.

Meanwhile, Meghan’s outing came as Harry announced he will begin a Caribbean tour on behalf of the Queen on November 20.